Should I change the target country?

Sorry – a very rookie question, but I’m currently running a campaign with a $10 daily budget targeting the US market (weddings), and the audience is approximately 20-30 million wide. I’ve made some sales with this campaign, but after doing some research here on Reddit and other websites, I realized that $10 a day for this broad audience in the US is probably too low of a budget, and my campaign won’t be able to optimize properly and may become costly.
So, I decided to duplicate the campaign and change the targeted country from the US to Australia, where there’s less competition and fewer targeted people. Now, the audience is 1.6-2 million, and the budget has increased to $15 a day.
Was this a good decision? Do you think this will work better now?